What exactly is SPMT - the strongest means of transport on land - part 2

SPMT can be configured with the following three types of pendulum axles

1. Driven pendulum axle - with hydraulic motor, it can obtain power from power unit PPU to drive SPMT;

2. Brake type tilting axle - no driving capacity, with compressed air braking device;

3. Driven pendulum axle - it has no driving capacity and braking device and can only follow up.

2. Self Propelled Modular Trailers - power unit PPU

PPU (power pack unit) is the power source of SPMT and an independent module. There are several lifting holes at the top of the crane to facilitate crane lifting; It can be seen that there are four universal wheels at the bottom, which is convenient for the PPU to be moved independently. Generally, the PPU is hung at the front of the SPMT module, and the two connectors on the upper edge are equipped with hydraulic devices. Through expansion and contraction, the PPU can be tilted up by 11 ° at most, and the PPU can be prevented from touching the ground when the SPMT goes uphill. The model skillfully uses the rotation of the screw to simulate the expansion and contraction of the hydraulic device, and PPU can adjust the elevation angle perfectly on the model. In practical application, PPU can also be fixed above SPMT module, which is often due to the consideration of reducing the total length of SPMT.

The core components of PPU are composed of diesel engine, hydraulic pump, control panel, etc. while PPU is connected with SPMT module, it also includes the docking of hydraulic oil pipe, compressed air pipe, control line, etc. The diesel engine drives the hydraulic pump and transmits the hydraulic power to the hydraulic motor driving the tilting axle in the SPMT module through the oil pipe, so as to drive the SPMT to run. A PPU is not necessarily only used to drive one SPMT module, but also can drive multiple modules at the same time. These modules need to be connected with PPU with hydraulic oil pipe, etc.